词汇	对称频率
释义	对称频率 second-channel frequency
随便看	have a frail constitution have a frame have a frank discussion have a free choice have a free hand Have a free hand in have a friend have a friendly talk have a fright have a frog in one's throat have a frog in your throat have a full deck have a full enrollment have a full figure have a full impact on Have a full order-book have a full realization of have a full realization of something Have a full realization of sth Have a full truerealization of sth Have a full true realization of sth Have a full [true]realization of sth have a future have against have a gallows look